//
//  GAKKIKeyChainStore.m
//  Interview
//
//  Created by fh on 2021/3/3.
//

#import "GAKKIKeyChainStore.h"

@implementation GAKKIKeyChainStore

#pragma mark - Public
+ (void)save:(NSString *)service data:(id)data {
    //Get search dictionary
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    //Delete old item before add new item
    SecItemDelete((CFDictionaryRef)keychainQuery);
    //Add new object to searchdictionary(Attention:the data format)
    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];
    //Add item to keychain with the searchdictionary
    SecItemAdd((CFDictionaryRef)keychainQuery,NULL);
}
+ (id)load:(NSString *)service {
    id ret = nil;
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    //Configure the search setting
    //Since in our simple case we areexpecting only a single attribute to be returned (the password) wecan set the attribute kSecReturnData to kCFBooleanTrue
    [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
    [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
    CFDataRef keyData = NULL;
    if(SecItemCopyMatching((CFDictionaryRef)keychainQuery,(CFTypeRef *)&keyData) == noErr) {
        @try{
            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];
        }@catch(NSException *e) {
            NSLog(@"Unarchiveof %@ failed: %@",service, e);
        }@finally{
            
        }
    }
    if(keyData) {
        CFRelease(keyData);
    }
    return ret;
}
+ (void)deleteKeyData:(NSString *)service {
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    SecItemDelete((CFDictionaryRef)keychainQuery);
}

#pragma mark - Private
+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {
    return[NSMutableDictionary dictionaryWithObjectsAndKeys:
           (id)kSecClassGenericPassword,(id)kSecClass,
           service,(id)kSecAttrService,
           service,(id)kSecAttrAccount,
           (id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,
           nil];
}

@end
